Which of the following eras in Earth's history is the longest?

Question

Quizplus · Accepted Answer

The Precambrian era spans from the formation of the Earth around 4.6 billion years ago until the beginning of the Cambrian period, which started around 541 million years ago. This makes the Precambrian era the longest, covering almost 90% of Earth's history. The Paleozoic, Mesozoic, and Cenozoic eras all followed the Precambrian era in that order, with each one being shorter than the one before it. The Cambrian period is just the first period of the Paleozoic era.

Which of the Following Eras in Earth's History Is the Longest